Connecting cosmologically decaying dark matter to neutrino physics
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915510718824448 |
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| author | Fuß, Lea Garny, Mathias Ibarra, Alejandro |
| author_facet | Fuß, Lea Garny, Mathias Ibarra, Alejandro |
| contents | Dark matter decays into invisible particles can leave an imprint in large-scale structure surveys due to a characteristic redshift-dependent suppression of the power spectrum. We present a model with two quasi-degenerate singlet fermions, $χ_1$ and $χ_2$, in which the heavier state decays as $χ_2 \to \bar χ_1 νν$ on cosmological time-scales, and that also accommodates non-zero neutrino masses. Remarkably, for parameters that yield the correct dark matter abundance via freeze-in and reproduce the observed neutrino masses, dark matter decay can produce detectable signals in forthcoming large-scale structure surveys, a diffuse anti-neutrino flux accessible to JUNO, and a gamma-ray line within the energy range probed by COSI. Both the cosmological lifetime of $χ_2$ as well as the small (radiatively induced) mass splitting among $χ_{1,2}$ are a natural consequence of the mechanism of neutrino mass generation within this model. This highlights the potential role of large-scale structure surveys in probing some classes of neutrino mass models. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_19596 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Connecting cosmologically decaying dark matter to neutrino physics Fuß, Lea Garny, Mathias Ibarra, Alejandro High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics Dark matter decays into invisible particles can leave an imprint in large-scale structure surveys due to a characteristic redshift-dependent suppression of the power spectrum. We present a model with two quasi-degenerate singlet fermions, $χ_1$ and $χ_2$, in which the heavier state decays as $χ_2 \to \bar χ_1 νν$ on cosmological time-scales, and that also accommodates non-zero neutrino masses. Remarkably, for parameters that yield the correct dark matter abundance via freeze-in and reproduce the observed neutrino masses, dark matter decay can produce detectable signals in forthcoming large-scale structure surveys, a diffuse anti-neutrino flux accessible to JUNO, and a gamma-ray line within the energy range probed by COSI. Both the cosmological lifetime of $χ_2$ as well as the small (radiatively induced) mass splitting among $χ_{1,2}$ are a natural consequence of the mechanism of neutrino mass generation within this model. This highlights the potential role of large-scale structure surveys in probing some classes of neutrino mass models. |
| title | Connecting cosmologically decaying dark matter to neutrino physics |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2509.19596 |